Mechanism for sharpening rock-drills.



No. 815,843. PATENTBD MAR. 20, 1906. i v W.-P. LIGHTBODY. 4 MECHANISM FOR SHARPENING ROGKDRILLS.

APPLICATION FILED JULY 2, 1904.

' 2 SHEETS-SHEET 1.

PATENTED MAR. 20, 1906. v

2 sums-bum 2.

W. P. LIGHTBODY. MECHANISM FOR SHARPENING ROCK DR-ILLS..

APPLICATION FILED JULY 2, 1904.

UNITED. STATES PATENT OFFICE.

WILLIAM PARR LIGH'l-BODY, OF JOHANNESBURG, TRANSVAAL. MECHANISM FOR SHARPENING ROCK-DRILLS.

I Specification of Letters Patent. I

Application filed July 2, 1994. Serial No. 215,139.

To all whom it may concern.-

Be. it known that I, WILLIAM PARR LIGHT- BODY, a subject of the King of Great Britain, and a resident of Langlaa te Deep, (Box 1 056,) Johannesburg, Transvaa but at present of Beehive Works, Bolton, in the county of Lancaster, England, have invented certain new and useful Improvements in Mechanism for Sharpening Rock-Drills, of which the following description, together with the accompanying sheets of drawings, is a specification.

My present invention relates to improvements in mechanism for sharpening rock-drills "of the class wherein the cutting edges converge so that they form a kind of star or cross, the bar of metal out of which they are formed having three or four ribs; and my said inven-. tion relates more particularly to means for performing the dollying actions upon said drills, which consists in forming the cutting edges of the drill of a desired shape by a die or dolly.

In the accompanying sheets of drawings, which are illustrative of my said invention, Figure 1 is a plan of my improved mechanism. Fig. 2 is aside elevation thereof. Figs. 3 and .4 are sectional side and end elevations, respectively, of the anchorage or holding device for the drill hereinafter described. Figs. 5 and 6 are sectional end elevation and sectional plan, respectively, drawn to an en-- larged scale, of the dolly and its bearings. Fig. 7 is asectional side elevation of said dolly. Figs[ 8 and 9 are sectional plan and sectional end elevation, respectively, also on enlarged scale, of the striking mechanism hereinafter described. Fig. 10 is a detail drawing showing the form ofrock-drill for the treatment of which my improved devices are a plicable.

As is well known, the rock-dri ls are subjected to the dollying operations while in a heated state to shape the cutting-surfaces after they have been operated upon by fullering" mechanism or other devices, through the instrumentality of which the converging edges of the ribs are forced outwardly to fill hammer 9, mounted in the casing 10, which slides upon bearings 11 on the framework B. Within the casing 10 are also mounted the springs 12 13, between which take the split washers 14, surrounding the end 15 ofthe rod 16, the opposite end of which is operated by the crank-shaft 17, mounted in bearings 18 and driven by the pulley 19. In this manner the blows given to the dolly '2 are transmitted through the springs 12 13.

Upon the framework 25, connected to the framework'B, I mount the anchorage or holder 8 within the opening 7, in which takes the end 6 of the drill during the actionsupon it of the dolly-or die 2. The anchorage or holder 8 is provided with a nut 20, which meshes With the screw 21, so that as this latter is ro tated by the hand-wheel 22, through the bevelgears 23 24, said nut and anchorage 8 will be traversed along the framework 25 nearer to or farther from the dolly 2, so that drills of varying lengths may be held between said dollyandlanchorage. The drill'while being acted upon rests loosely in bearing 7 and an extension of bearing 3 and is free to turn to adjust itself to the shaping-surface of the dolly. The force of the blows given by the hammer 9 is withstood by the head 26 of the screw 21 which takes against a part 27 of the framework B, as shown inbroken lines, Fig. 2.

In order to bring the striking mechanism into use only at such times as a drill is in position for the dolly 2 to act upon it, I arrange the bearings 3 to slide upon the plate 4 against the tenslon of the spring as the anchora e 8, containing a drill 5, is moved longitudmally to bring said drill into position. This movement .of the bearings 3 transmits movement to the lever 36, fulcrumed at 37 on the' plate 4, its outer end being connected to the rod 38 by the eyebolt 39. The rod 38 is connected to the arm 40 of the belt-fork 41, which is fulcrumed at 42 in the bearings 43. By these means as the dolly 2 and bearings 3 'are moved by the drill 5 the belt-fork 41 moves the driving-belt from the loose pulley 44 to the fast pulley 19, and so brings into action the strikinghammer 9. The parts are returnedto their normal or inoperative positions by the springs 35 and 45 after the drill has been withdrawn.

The mouth of the dolly 2 is formed of the shape shown by Fig. 7 in order that it may cause the outer edges of the wings of the drill to extend in front of the central parts, this formation of the drill being necessary before subjecting it to other parts of the process of sharpening or making the drill, While When it is desired to form the cutting edges straight or at right angles to the body part of the drill this may be effected by raising the end 6 Within the opening 7, as shown by the broken line a, Fig. 2, or 1t may in some cases suffice to employ a dolly with a straight mouth instead of the one hereinbefore described.

The dolly herein shown is for operatingupon a drill having four Wings or ribs. However, it Will be readily understood that it may be modified in construction so as to operate upon drills having three of such Wings or ribs.

Having thus described the nature and object of my said invention, What I claim is 1. An apparatus of the character described comprising a dolly, an operating device therefor, means for supporting a drill, and means for automatically controlling said operating device, said means including the drill-support.

2. An apparatus of the character described comprising a yieldingly-mounted dolly, means for operating the same, and means for automatically controlling said operating means, said controlling means being connected With said dolly.

3. An apparatus of the character described comprising a dolly, a reci rocating yielding bearing therefor, means or operating said dolly, and a controller for said operating means, said controller being in engagement with said bearingg 4. An apparatus of the character described comprising a dolly, a reciprocating bearing therefor, means for operating said dolly said means including a power-shaft having fast and loose pulleys thereon, and a belt-shifter adjacent said pulleys and operatively connected with said bearing.

5. An apparatus of the character described comprising a dolly, a spring-pressed yielding bearing therefor, a hammer adapted to strike said dolly, and means connected with said dolly-bearing for automatically controlling the operation of said hammer.

6. An apparatus of the character described comprising a dolly, a spring-pressed yielding bearing therefor, a hammer adapted to strike said dolly, means for reciprocating said hammer, and a controller for said reciprocating means, said controller being in engagement With said dolly-bearing.

7. An apparatus of the character described comprising a yield able bearing, a dolly mounted therein and having an enlarged head forming a shoulder engaging said bearing, means for operating said dolly, and a controller for said operating means, said controller being in engagement with said bearing.

In testimony whereof I have affixed my signature in presence of tWo Witnesses.

WILLIAM FARR LIGHTBODY.

Witnesses:

SAMUEL I-IEY, JAMES HENRY ELLIsON. 

